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US 10,208,076 B2Granted
Renewable aromatics from lignocellulosic lignin
AssigneeNational Technology & Engineering Solutions of Sandia, LLC
InventorsSeema Singh, Patanjali Varanasi, Blake Simmons
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Abstract
The present invention provides novel and improved processes for treating a lignocellulosic biomass or technical lignin using ionic liquids to obtain lignin breakdown products and polysaccharide biomass components. Recycling of ionic liquids can be included in the methods of the invention.
Claims11
A composition containing monomeric guaiacol, 4-ethyl guaiacol, 4-vinyl guaiacol, eugenol, syringol, 4-(1-propenyl) guaiacol, vanillin, allyl syringol, and guaiacylacetone, wherein the composition is formed by:
- i) solubilizing a technical lignin in a solution comprising a water-miscible ionic liquid (IL) to generate a solubilized material;
- ii) precipitating a fraction of the solubilized material with a polar solvent to generate a precipitated fraction and a supernatant;
- iii) extracting the lignin compounds from the supernatant by contacting the supernatant with an extractant;
- and
- iv) separating the lignin compounds from the extractant;
- wherein the extractant is a non-polar solvent.
3 more elements
A method comprising:
- i) contacting a technical lignin with an ionic liquid for at least about 3 hours to generate a solubilized material;
- ii) precipitating a fraction of the solubilized material with a polar solvent to generate a precipitated fraction and a supernatant;
- iii) extracting monomeric lignin compounds from the supernatant with an extractant;
- and
- iv) separating the lignin compounds from the extractant;
- wherein the monomeric lignin compounds are selected from the group consisting of guaiacol, 4-ethyl guaiacol, 4-vinyl guaiacol, eugenol, syringol, 4-(1-propenyl) guaiacol, vanillin, allyl syringol, guaiacylacetone, and combinations thereof, and
- wherein the extractant is a non-polar solvent.
4 more elements
Dependencies are inferred from the claim text.